Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
   Class Reptilia Linnaeus, 1758 - reptiles
     Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
       Infraclass Archosauromorpha Huene, 1946 see Clade Archosauromorpha Huene 1946 [Benton 1985], nom. cl. inval.
         Superorder Archosauria Cope, 1869 - archosaurs see Clade Archosauria Cope 1869 [Gauthier & Padian 1985], nom. cl. inval.
           Order †Ornithischia Seeley, 1887
             Suborder †Ornithopoda Marsh, 1871 see Infraorder Ornithopoda Marsh, 1881
               Family †Iguanodontidae Cope, 1869
                 1 Genus †Callovosaurus Galton, 1980
                 2 Genus †Camptosaurus Marsh, 1885
                 3 Genus †Iguanodon Mantell, 1825
                 4 Genus †Muttaburrasaurus Bartholomai & Molnar, 1981
                 5 Genus †Ouranosaurus Taquet, 1976
                 6 Genus †Probactrosaurus Rozhdestvenskii, 1966
                 7 Genus †Vectisaurus Hulke, 1879, nom. dub.